The cloud monitor by an infrared camera at the Telescope Array experiment
- University of Yamanashi, Kofu, Yamanashi, Japan 400-8511 (Japan)
The mesurement of the extensive air shower using the fluorescence detectors (FDs) is affected by the condition of the atmosphere. In particular, FD aperture is limited by cloudiness. If cloud exists on the light path from extensive air shower to FDs, fluorescence photons will be absorbed drastically. Therefore cloudiness of FD's field of view (FOV) is one of important quality cut condition in FD analysis. In the Telescope Array (TA), an infrared (IR) camera with 320x236 pixels and a filed of view of 25.8 deg. x19.5 deg. has been installed at an observation site for cloud monitoring during FD observations. This IR camera measures temperature of the sky every 30 min during FD observation. IR camera is mounted on steering table, which can be changed in elevation and azimuthal direction. Clouds can be seen at a higher temperature than areas of cloudless sky from these temperature maps. In this paper, we discuss the quality of the cloud monitoring data, the analysis method, and current quality cut condition of cloudiness in FD analysis.
- OSTI ID:
- 21608323
- Journal Information:
- AIP Conference Proceedings, Vol. 1367, Issue 1; Conference: International symposium on the recent progress of ultra-high energy cosmic ray observation, Aichi (Japan), 10-12 Dec 2010; Other Information: DOI: 10.1063/1.3628736; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
APERTURES
ASTROPHYSICS
CAMERAS
COSMIC PHOTONS
COSMIC RAY DETECTION
EXTENSIVE AIR SHOWERS
FLUORESCENCE
MONITORING
SOLID SCINTILLATION DETECTORS
TELESCOPE COUNTERS
BOSONS
COSMIC RADIATION
COSMIC SHOWERS
DETECTION
ELEMENTARY PARTICLES
EMISSION
IONIZING RADIATIONS
LUMINESCENCE
MASSLESS PARTICLES
MEASURING INSTRUMENTS
OPENINGS
PHOTON EMISSION
PHOTONS
PHYSICS
RADIATION DETECTION
RADIATION DETECTORS
RADIATIONS
SCINTILLATION COUNTERS
SECONDARY COSMIC RADIATION
SHOWERS